Consider a Stop-and-Wait protocol. Assume constant delays for all transmissions

Question

Consider a Stop-and-Wait protocol. Assume constant delays for all transmissions and the same delay for packets sent and ACKs sent. Assume no errors occur during transmission.

(a) Suppose that the timeout value is set to 1/2 of what is required to receive an acknowledgement, from the time a packet is sent. Give the complete sequence of frame exchanges when the sender has 3 frames to send to the receiver.

(b) Suppose that the timeout value is sent to 2 times the round trip time. Give the sequence of frame exchanges when 3 frames are sent but the first frame is lost.

Explanation / Answer

a)when the timeout =1/2

when the sender sends the1 st packet then it will wait for the ackowledgement from the reciever but the time will reduce to half when it sets the frame size to 2 that means 2 packet sent together then the reciever will send the ackownledgement of only 1 packet.

b) timeout =2times

when the framse size will set to 3 then 1st frame will lost because the timeout becomes 2 times.

because the sender will wait for the ackownledgment and then it will send the other packets

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